use rand::Rng;
use std::cmp::Ordering;
use std::io;

fn main() {
    println!("Guess the number!");

    let secret_number = rand::thread_rng().gen_range(1..100);

    println!("The secret number is {}", secret_number);

    loop {
        // loop forever
        println!("Please input your guess.");

        let mut guess = String::new(); // mut means mutable

        io::stdin()
            .read_line(&mut guess)
            .expect("Fail to read line");

        let guess: u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => {
                continue;
                // println!("Please input a number!");
                // return;
            }
        };

        // println!("You guessed: {}", guess); // {} is a placeholder

        match guess.cmp(&secret_number) {
            Ordering::Less => println!("Too small!"),
            Ordering::Greater => println!("Too big!"),
            Ordering::Equal => {
                println!("You win!");
                break;
            }
        }
    }
}
